Update requests to 2.22.0
Created by: pyup-bot
This PR updates requests from 2.21.0 to 2.22.0.
Changelog
2.22.0
-------------------
**Dependencies**
- Requests now supports urllib3 v1.25.2.
(note: 1.25.0 and 1.25.1 are incompatible)
**Deprecations**
- Requests has officially stopped support for Python 3.4.Links
- PyPI: https://pypi.org/project/requests
- Changelog: https://pyup.io/changelogs/requests/
- Homepage: http://python-requests.org